package com.inspect.protocol;

import java.security.Key;
import java.security.Security;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;

import javax.crypto.Cipher;

import com.inspect.dbConn.dbSingleton;

public class desEncrypt {
	private static String strDefaultKey = "gzcss";
	private Cipher encryptCipher = null;
	private Cipher decryptCipher = null;

	/**
	 * 将byte数组转换为表示16进制值的字符串， 如：byte[]{8,18}转换为：0813， 和public static byte[]
	 */
	public String byteArr2HexStr(byte[] arrB) throws Exception {
		int iLen = arrB.length;
		// 每个byte用两个字符才能表示，所以字符串的长度是数组长度的两倍..一个byte转成16进制最多不会超过两位。FF
		StringBuffer sb = new StringBuffer(iLen * 2);
		for (int i = 0; i < iLen; i++) {
			int intTmp = arrB[i];
			// 把负数转换为正数
			while (intTmp < 0) {
				intTmp = intTmp + 256;
			}
			// 小于0F的数需要在前面补0
			if (intTmp < 16) {
				sb.append("0");
			}
			sb.append(Integer.toString(intTmp, 16)); // 16代表进制
		}
		return sb.toString();
	}

	/**
	 * 将表示16进制值的字符串转换为byte数组， 和public static String byteArr2HexStr(byte[] arrB)
	 * 互逆
	 */
	public byte[] hexStr2ByteArr(String strIn) throws Exception {
		byte[] arrB = strIn.getBytes();
		int iLen = arrB.length;

		// 两个字符表示一个字节，所以字节数组长度是字符串长度除以2
		byte[] arrOut = new byte[iLen / 2];
		for (int i = 0; i < iLen; i = i + 2) {
			String strTmp = new String(arrB, i, 2);
			arrOut[i / 2] = (byte) Integer.parseInt(strTmp, 16);
		}
		return arrOut;
	}

	/* */
	public desEncrypt() throws Exception {
		Security.addProvider(new com.sun.crypto.provider.SunJCE());
		Key key = getKey(strDefaultKey.getBytes());

		encryptCipher = Cipher.getInstance("DES");
		encryptCipher.init(Cipher.ENCRYPT_MODE, key);

		decryptCipher = Cipher.getInstance("DES");
		decryptCipher.init(Cipher.DECRYPT_MODE, key);
	}

	/**
	 * encrypt byte[]
	 */
	public byte[] encrypt(byte[] arrB) throws Exception {
		return encryptCipher.doFinal(arrB);
	}

	/**
	 * encrypt String
	 */
	public String encrypt(String strIn) {
		try {
			if (strIn == null || strIn.equals("")) {
				return strIn;
			}
			return byteArr2HexStr(encrypt(strIn.getBytes()));
		} catch (Exception e) {
			e.printStackTrace();
		}
		return strIn;

	}

	/**
	 * decrypt byte[]
	 */
	public byte[] decrypt(byte[] arrB) throws Exception {
		return decryptCipher.doFinal(arrB);
	}

	/**
	 * decrypt String
	 */
	public String decrypt(String strIn) throws Exception {
		if (strIn == null || strIn.equals("")) {
			return strIn;
		}
		return new String(decrypt(hexStr2ByteArr(strIn)));
	}

	/**
	 * 产生key实例
	 */
	private Key getKey(byte[] arrBTmp) throws Exception {
		// 创建一个空的8位字节数组（默认值为0）
		byte[] arrB = new byte[8];

		// 将原始字节数组转换为8位
		for (int i = 0; i < arrBTmp.length && i < arrB.length; i++) {
			arrB[i] = arrBTmp[i];
		}

		// 生成密钥
		Key key = new javax.crypto.spec.SecretKeySpec(arrB, "DES");

		return key;
	}

	public static void main(String[] args) throws Exception {
		desEncrypt des = new desEncrypt();
//		dbSingleton db = dbSingleton.get_instance();
//
//		/* decrypt */
//		ArrayList<HashMap<String, String>> al = new ArrayList<HashMap<String, String>>();
//
//		al = db.db_query_assoc("select uname,pwd from t_inspect_asset");
//
//		Iterator<HashMap<String, String>> it = al.iterator();
//
//		while (it.hasNext()) {
			/* column case sensitive */
			System.out.println("-----------------------");
//			String pwd = it.next().get("PWD");
			String pwd = "gzcss@123";
			String s = des.encrypt(pwd);
			System.out.println("原文："+pwd);
			System.out.println("加密之后："+s);
			System.out.println("解密之后："+des.decrypt(s));
//		}
	}
}